## Detailed description

- y = cos x, local minimums in quadrants 2 and 3, x-intercepts at (−3π over 2, 0), (−π over 2, 0), (π over 2, 0), and (3π over 2, 0), y-intercepts at (0,1).
- y = 1 − one half x squared, concave parabola, turning point at (0,1), x-intercepts at (−π over 2, 0) and (π over 2, 0).